A study on free volume of acrylonitrile-styrene copolymer and methyl methacrylate-styrene copolymer by using positron annihilation

✍ Scribed by Chenze Qi; Shuihe Zhang; Yanjie Wu; Yurong Zhong; Dakang Song; Tianmin Wang

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 151 KB
• Volume: 37
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19990301)37:5<465::aid-polb7>3.0.co;2-v

✦ Synopsis

The o-Ps lifetime 3 and the intensity I 3 of ST-AN copolymers and ST-MMA copolymers have been determined by using the positron annihilation technique. The average free volume hole radius R is estimated according to Tao's and Eldrup's model. The result shows that the average free volume hole size mainly attributes to lateral group volume and polarity of macromolecular chain as well as polymerizing temperature, and the o-Ps intensity I 3 to the effect of the lateral group volume and the polarity.